Jimny problem. Gas flow back out when filling low tank

[Garrett Inside]

Does anyone know why my jimny has this problem?
I've now got it and it happened twice. The tank was quarter and I had to fill it real slow for the gas to go in otherwise it would gush back out. It eventually took about $40. And it was filled to the brim. When I started it showed a little over half tank only and the gas at the brim went down.
It a foreign used with the 660 turbo unit. It seems like a kinda airlock problem.

Also who else besides dean wheels sells the aftermarket fender flares. They are out of stock.

[Ignorant Ignis]

check the vent hose to see if its clogged or being squeezed

[Garrett Inside]

Will check, thanks

[Garrett Inside]

The vent piping from the tank, was blocked with what looked like rusty dirt. I removed the hoses and prodded them till they were clear. There is also a check valve (three flaps in a tube)just before the tank on the main gas hose used to fillup. I suspect this was remaining closed when the tank could not vent the air.
I haven't used a gas station pump as yet but with a gas container I was able to fill up without the backwash of gas. So so far so good.

Thanks ignorant ignis fella!

[Ignorant Ignis]

no probs